Bug 1236266 - Use release assert in IPC serialization for regions (r=jmuizelaar)

gfx/ipc/GfxMessageUtils.h

@@ -377,7 +377,7 @@ struct RegionParamTraits
   {
     Iter it(param);
     while (const Rect* r = it.Next()) {
-      MOZ_ASSERT(!r->IsEmpty());
+      MOZ_RELEASE_ASSERT(!r->IsEmpty());
       WriteParam(msg, *r);
     }
     // empty rects are sentinel values because nsRegions will never